# commons[](https://circleci.com/gh/sinonjs/commons)[](https://codecov.io/gh/sinonjs/commons)<ahref="CODE_OF_CONDUCT.md"><imgsrc="https://img.shields.io/badge/Contributor%20Covenant-v2.0%20adopted-ff69b4.svg"alt="Contributor Covenant"/></a>Simple functions shared among the sinon end user libraries## Rules* Follows the [Sinon.JS compatibility](https://github.com/sinonjs/sinon/blob/master/CONTRIBUTING.md#compatibility)* 100% test coverage* Code formatted using [Prettier](https://prettier.io)* No side effects welcome! (only pure functions)* No platform specific functions* One export per file (any bundler can do tree shaking)